英语词汇touch-needle怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	touch-needle
释义	touch-needlen. a needle of gold or silver alloy of known composition used as a standard in testing other alloys on a touchstone 试金针(用已知成分的金或银合金制成的针，在试金石上用以检验其他合金的标准)
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